Solar pSEO Landing

Texas 12V Off-Grid Solar Calculator P2

Profile 2: size battery Ah and panel watts for Texas conditions at 12V using 5.6 peak sun hours and 1-day backup.

Sizing Snapshot

Daily Energy

1807 Wh

Battery Bank

181.8 Ah

Solar Array

440 W

Inverter Baseline

1250 W

Appliance	Power	Daily Runtime	Wh/Day
Fridge (60W x 24h)	60 W	24.00 h	1440 Wh
Microwave (1000W x 10m)	1000 W	0.17 h	167 Wh
LED Lights (40W x 5h)	40 W	5.00 h	200 Wh

Balanced shoulder-season irradiance and heat-driven load spikes.

Use local monthly irradiance data to tune peak-sun-hour assumptions before procurement.

Cloud-prone months usually benefit from higher autonomy targets and larger reserve buffers.

For winter-heavy climates, panel overbuild is often cheaper than repeated battery deep cycles.

The calculator estimates 440 W panel capacity after charge and derate factors.

For the same energy demand, lower voltage systems need more current. That translates into larger Ah requirements and often thicker cabling.

In low-sun conditions, panel oversizing usually improves daily recovery. In high-cloud windows, additional battery autonomy reduces outage risk.

Yes, the model applies chemistry-specific assumptions for DoD and charging to keep estimates closer to practical planning ranges.